With reference to FIG. 19, the system of indicating characteristic of problem and characteristic of problem set according to one embodiment of the present invention comprises an attribute defining part (10), a problem characteristic determining part (20), a problem set characteristic determining part (30) and a visualization part (40). It should be noted that in some embodiments a system of indicating characteristic of problem and characteristic of problem set having elements less or more elements than the embodiment depicted in FIG. 19 can be implemented. Also, the method for indicating characteristic of problem set according to the embodiments of the present invention can be implemented by the system of indicating characteristic of problem and characteristic of problem set according to one embodiment of the present invention.

The attribute defining part (10) can define a plurality of attributes for expressing characteristic of problems included in problem set or for expressing characteristic of problem. The defined plurality of attributes can be stored in an attribute database (11) included in the attribute defining part (10).

In some embodiments, a plurality of attributes can be pre-stored in the attribute database (11), but is not limited thereto.

The problem characteristic determining part (20) can determine characteristic of each problem included in problem set, or can determine characteristic of a single problem. The characteristic of each problem can be determined by attributes related with the problem and correlations between the attributes.